Abstract
In the coal cryogenic volume fracturing, the variations of temperature field, seepage field, and stress field of coal are the foundation to study fracture propagation in the condition of cryogenic injection. Taking 3# high-rank coal sample from Jincheng City of Shanxi Province as study object, based on coal mechanics tests and permeability tests in complete stress–strain process under cryogenic conditions, a thermo-hydro-mechanical coupling mode is introduced under the condition of low-temperature phase change and a THM coupling numerical model of high-rank coal is established. The effect of different treatment parameters, porosity, permeability, thermodynamic parameters, and coal cleat on temperature field, seepage field, and stress field during the cryogenic volume fracturing is simulated. The results show that the temperature field is mainly subjected to the influence of treatment parameters, porosity and permeability, and thermodynamic parameters of coal. As for the seepage field, it suffers the influence of both injection and mechanical parameters. In addition, the stress field is principally affected by treatment parameters, permeability, and modulus of elasticity. Additionally, cleat that exists is also able to substantially increase the influence area of cryogenic fluids on three fields mentioned above.
Copyright 2017, Shaanxi Petroleum Society.
This paper was prepared for presentation at the 2017 International Field Exploration and Development Conference in Chengdu, China, 21–22 September 2017.
This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC&IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.
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Acknowledgements
The financial support for this research was provided by the engineering technology research institute of Huabei oilfield, and is greatly appreciated. Also, the author would like to thank the input from Mr. Yu. Last, I give my most sincere love to my family, their company is the biggest encouragement for me.
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Yu, X. et al. (2019). Research on Coal Thermo-Hydro-Mechanical Coupling Model and Influence Factors. In: Qu, Z., Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2017. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7560-5_162
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DOI: https://doi.org/10.1007/978-981-10-7560-5_162
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